EP 0391873 B1 19931103 - Drilling tool.
Title (en)
Drilling tool.
Title (de)
Bohrwerkzeug.
Title (fr)
Outil de forage.
Publication
Application
Priority
SE 8901198 A 19890405
Abstract (en)
[origin: EP0391873A2] A drilling tool is followed by a casing tube (11) down the drilled hole. The mouth of the casing tube (11) centers rotatably a guide member (10) which receives rotation and impact energy via the interior of the casing tube (11). A drill bit (20) consists integrally of an axially protruding pilot portion (23), a sidewise projecting eccentric portion (22) and a rear shaft (21). The shaft (21) extends pivotally and axially movably into an eccentrically disposed bore (24) in the guide member (10). Axially spaced peripheral end grooves (30,32) extend in opposite direction from an axial cam groove (31) on the shaft (21) and are engaged by a follower (28) in the guide member (10) defining positively the axial and angular movability and positions thereof relative to the drill bit (20). In the forward end groove (32) the follower (28) maintains the drill bit (20) axially in drilling position adjacent to the guide member (10) with the eccentric portion (22) protruding to drill a hole larger than the casing tube (11). In an intermediate position 90 DEG away from the drilling position, the follower (28) enters the cam groove (31) whereby the guide member (10) becomes axially movable the distance between the end grooves (30,32). In a rear axial position the guide member (10) by a continued 90 DEG turn brings the follower (28) into the rear end groove (30) to axially define the retracted position of the drill bit (20), wherein it can be raised or lowered freely through the casing tube (11).
IPC 1-7
IPC 8 full level
E21B 7/20 (2006.01); E21B 10/32 (2006.01); E21B 10/66 (2006.01)
CPC (source: EP US)
E21B 7/20 (2013.01 - EP US); E21B 10/327 (2013.01 - EP US); E21B 10/40 (2013.01 - EP US); E21B 10/66 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI
DOCDB simple family (publication)
EP 0391873 A2 19901010; EP 0391873 A3 19910403; EP 0391873 B1 19931103; AT E96883 T1 19931115; DE 69004316 D1 19931209; DE 69004316 T2 19940324; ES 2046770 T3 19940201; SE 501988 C2 19950710; SE 8901198 D0 19890405; SE 8901198 L 19901006; US 5009274 A 19910423
DOCDB simple family (application)
EP 90850127 A 19900403; AT 90850127 T 19900403; DE 69004316 T 19900403; ES 90850127 T 19900403; SE 8901198 A 19890405; US 50372490 A 19900403